** Also affects: neutron/kilo
Importance: Undecided
Status: New
** Changed in: neutron/kilo
Status: New => Fix Committed
** Changed in: neutron/kilo
Milestone: None => 2015.1.2
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https://bugs.launchpad.net/bugs/1494336
Title:
Neutron traceback when an external network without IPv6 subnet is
attached to an HA Router
Status in neutron:
Fix Released
Status in neutron kilo series:
Fix Committed
Bug description:
For an HA Router which does not have any subnets in the external network,
Neutron
sets the IPv6 proc entry[1] on the gateway interface to receive Router Advts
from
external IPv6 router and configure a default route pointing to the LLA of the
external IPv6 Router.
Normally for an HA Router in the backup state, Neutron removes Link Local
Address (LLA)
from the gateway interface.
In Kernel version 3.10 when the last IPv6 address is removed from the
interface,
IPv6 is shutdown on the iface and the proc entries corresponding to the iface
are deleted (i.e., /proc/sys/net/ipv6/conf/<interface>)
This issue is resolved in the later kernels [2], but the issue exists on
platforms with Kernel version 3.10
When IPv6 proc entries are missing and Neutron tries to configure the proc
entry we see the following traceback [3] in Neutron.
[1] /proc/sys/net/ipv6/conf/qg-1fc4061d-3c/accept_ra
[2]
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=876fd05ddbae03166e7037fca957b55bb3be6594
[3] Trace:
Command: ['ip', 'netns', 'exec',
'qrouter-e66b99aa-e840-4a13-9311-6242710a5452', 'sysctl', '-w',
'net.ipv6.conf.qg-1fc4061d-3c.accept_ra=2']
Exit code: 255
Stdin:
Stdout:
Stderr: sysctl: cannot stat
/proc/sys/net/ipv6/conf/qg-1fc4061d-3c/accept_ra: No such file or directory
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